Branding a SharePoint Site can be pretty tricky and time consuming. If you want to give it a try, check out Celina Baginski’s 15 tips on branding SharePoint over on SharePoint Pro Magazine.
If you are even more serious, a friend of mine recommends Professional SharePoint 2010 Branding and User Interface Design (Wrox).

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Cool article!
But make it easy and don’t waste your time with searching for the right css tags.
Just use this unique SharePoint 2010 Branding Tool:
http://www.nextflow.at/eng/pages/plugnplay.aspx
Cheers and have fun!!